🚨❗️🚨 New Paper Alert
My postdoctoral work now out in
@Nature
. We find that sensory neurons drive breast cancer metastasis via an activity-dependent paracrine signalling mechanism mediated by substance-P, extracellular ssRNA & TLR7 receptor. (1/11)
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What causes metastatic tumors to be more innervated? We discovered an unexpected role for the tumor endothelium: SLIT2, an axon guidance cue released by endothelial cells of metastatic tumors drives innervation. Builds nicely off previous work from our lab (Nature, 2020). (3/11)
Breast tumors don’t show evidence of perineural invasion, a prognostic factor in other cancers. Yet mammary glands are very innervated. We find breast tumors are frequently innervated by sensory neurons and extent of tumor innervation correlates with metastatic capacity (2/11)
Excitingly, this neuro-cancer axis is targetable! An approved anti-nausea drug, aprepitant is a TACR1 antagonist that significantly impairs tumor growth and metastasis across models. Prospective studies are required to test its clinical efficacy as an anti-metastatic drug (8/11)
Cancer cells hyper-activate neurons to promote release of substance-P (SP) and drive metastasis. Loss of host-derived SP significantly inhibits metastasis. (5/11)
In 3D organotypic co-cultures, sensory neurons drive tumor growth, invasion, and colony formation. For the first time, we also show a requirement for sensory innervation in breast cancer metastasis in vivo. (4/11)
Cancer cell derived ssRNAs then activate tumoral TLR7 receptors in a non-canonical, MyD88-independent, immune-independent, PI3K-dependent manner to drive breast cancer metastasis. This TLR7 gene signature associates with poor survival in breast cancer patients. (7/11)
An unexpected twist: SP promotes release of ssRNAs from cancer cells and promote metastasis in an RNA-dependent manner. This RNA is coming from a small fraction of apoptotic cells that overexpress SP’s receptor, TACR1. A case of altruistic suicide! (6/11)
This work complements findings from
from Brian Davis,
@UdeMTalbotlab
, Moran Amit,
@MadeleineOudin
and others revealing how sensory innervation can regulate tumor progression across multiple peripheral cancers through cancer cell-autonomous or non-autonomous effects. (9/11)
@Ella_Maru
@Nature
Thank you! This could be worth exploring in tumors innervated by sensory nerves (seen in PDAC, head and neck, colon, and several more).